guilford



OE. Fm EN UE um WM R.

(No Model.)

NTTED STATES PATENT Ferca.

RUSSEL W. GUILFORD, OF AUBURN, INDIANA, ASSIGNOR TO THE AUBURN IRONWORKS, OF SAME PLACE.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 542,930," dated July16, 1895.

Application filed November 9, 1894. Serial No. 52832 (N0 modem providean improved valve of novel construetion whereby better results areobtained and in which no poundingv or knocking is had, this latterresult being attained by means of yielding bumpers or cushions at theends of the steam-chest. ment of steam and exhaust ports and a peculiarconstruction of the valve itself.

Other objects and advantages of the inven-y tion will hereinafterappear, and the novel by the appended claims.

The invention is clearly illustrated in the accompanying drawing, which,with theY letters of reference marked thereon, forms a part of thisspecification, and in which is shown a substantially centrallongitudinal features thereof will be specifically defined vsectionthrough the steam-cylinder, steamchest, and valve, with' portions inelevation and a portion broken away.

Referring now to the details of the drawing by letter,Adesignates thesteam-cylinder; B the piston-rod B', the stuffing-box, and C the doublehollow piston carried by said rod lwithin the said cylinder, the headsof the piston being provided with annular peripheral packing-rings cseated vin grooves therein, as shown. The cylinder hasat its oppositeends the exterior chambers A', having communication with the interior ofthe cylinder through the passages d, and in these passages are guidedthe stems a of the valves A2. These chambers are closed at their outerends by the removable caps or plugs a2, as shown.

D is the steam-chest. It is mounted on the cylinder in any suitablemanner and is provided with the steam-inlet supply-pipe D', as shown,adapted to be connected with any suitable generator or source of steamsupply.

I provide a novel arrange- E is the hollow steam-Valve fitted to movewithin the steam-chest and having at each end a longitudinal port d andprovided with the peripheral depressions d', as shown, which 55communicate with the steam-pipe from the generator and with the cylinderby means hereinafter set forth. This valve has also the openings eleading from' the said depressions to the interior of the hollow valve..6o These peripheral depressions form live-steam recesses, as willbereadily seen. i This valve is provided with the packing-rings E' asshown,which are arranged upon opposite sides of the depressions.

F are live-steam ports leading from opposite ends of the cylinder A tothe valve-chest near the center thereof to correspond with thedepressions in the valve to drive the piston first to the right and thento the left. 7o They extend as shown, entering the cylinder inaninclined direction.

G are ports leading from the steam-chest near the center of the lengththereof to the chambers A' at the ends of the steam-cylinder. 7-

-H are exhaust-ports from the ends of the valve-chest to the center ofthe cylinder, crossing each other near their entrance into the cylinder.

I is the exhaust from the cylinder from near the longitudinal centerthereof, yand I' is the exhaust from the center of the valve-chestthrough a passage or channel z' in the wall of the steam-cylinder.

Each end of the Valve-chest is provided with an extension J, which, asshown, is detachably secured in the ends thereof and is provided with astuffing-box J', through which works the stem c of a bumper K, aroundwhich stem, between the valve or bumpera-nd the 'end of 90 theextension, is a spring L, as shown. The spring normally holds the bumperor valve Hush with the inner end of the extension, as

shown.

With the parts constructed and arranged substantially as above set forththe operation will be as follows: Steam being admitted through the pipeD' it will flow into the depressions d ofthe valve' and through them andthe holes e into the interior of the valve xoo and from thence throughthe ports d at the ends into the valve-chest. As shown, the lefthand endof the valve-chest is exhausting through the port Il at the left-handend into the double piston and to the atmosphere through the exhaust I.Steam will pass through the port F at the right-hand end and behind thepiston, moving it to the left until the packing-ring of the righthandhead of the piston closes the port H of the left-hand end of thevalve-chest. Now the right-hand port II has exhausted its pressure fromthe end of the valve and the pressure Will rise through the port d andmove the valve to the right. This admits steam through the port F to theleft-hand end of the steam-cylinder and exhausts the right-hand end. Nowthe piston will move to the right again, and so on with a continuousstroke. The piston is at one end of its stroke when the valve is at theopposite end of its stroke. The piston is cushioned at the end ot itsstroke by the noiseless steamcushion formed by the cavities or chambersA at the ends of the steam-cylinder and the valve therein as follows:When the piston reaches nearly the end of its stroke, the steam passingthrough the passage G from the valvechest, being nearly closed by thevalve E, the valve A2 is opened and steam admitted, which arrests thepiston-head and prevents its striking against the end of the cylinder.When the piston starts on its return stroke the valve A2 again closes.This valve forms a sort of governor. When the piston opens the saidvalve it doubles the portage and the pressure against the said piston.

The valve is cushioned by the spring-actuated bumpers K, as will bereadily understood.

Vhat I claim as new is- 1. The combination with the steam cylinderhaving end extensions forming charnbers communicating with the cylinderand having independent passages therefor toward the center of the valvechest, valves located in said chambers with their stems guided inopenings in the ends of the cylinder, and the steam chest, of a hollowsteam valve fitted therein and provided with peripheral depressions andwith steam ports at its ends and ports leading from the end peripheraldepressions into the interior of the valve, substantially as specified.

2. The combination with the steam cylinder having end extensions formingchambers communicating with the cylinder and having independent passagestherefor toward the center of the valve chest, valves located in saidchambers with their stems guided in openings in the ends of thecylinder, and the steam chest, of a hollow steam valve fitted thereinand provided with peripheral depressions and with steam ports at itsends and ports leading from the end peripheral depressions into theinterior ot' the valve and peripheral packing rings upon opposite sidesof said peripheral depressions, substantially as specified.

3. The combination with the steam cylinder having at each end anexterior chamber communicating with the interior thereof, valves in saidchambers, removable caps to said chambers,ports leading to the steamspace of the peripheral depressions of the steam Valve, a hollow steamvalve with peripheral depressions, a steam chest with exhaust ports fromthe ends to a point near the longitudinal center ot' the cylinder,substantially as specified.

4C. The combination with the steam cylinder having at each end anexterior chamber communicating with the interior thereof, valves in saidchambers, removable caps to said chambers,ports leading tothe steamspace of the peripheral depressions of the steam valve, a hollow steamvalve with peripheral depressions, a steam chest With exhaust ports fromthe ends to a point near the longitudinal center of the cylinder, saidvalve having steam passages at its ends and passages leading from itsinterior to the peripheral depressions and removable extensions to thesteam chest provided with spring cushions for the valve, substantiallyas specified,

5. The combination with the steam cyliuder and its ports, piston andexterior chambers with valves, of the steam chest with its ports andhollow valve with ports and openings, the extensions ou the ends of thesteam chest with removable stuiiing boxes and the spring actuatedpistons in said extensions and constructed to serve as yielding cushionsfor the valve, all substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

RUSSEL W. GUILFORD. Witnesses:

JAMEs Il. Rose,

ARTHUR L. THOMAS.

IOO

